* Adaptation of Tanigawa Nagaru's fourth Suzumiya Haruhi light novel.

It is mid-December, and SOS Brigade chief Suzumiya Haruhi announces that the brigade is going to hold a Christmas party in their clubroom, with Japanese hotpot for dinner. The brigade members Kyon, Nagato Yuki, Asahina Mikuru and Koizumi Itsuki start preparing everything for the party, such as costumes and decorations. But a couple of days later, Kyon arrives at school only to find that Haruhi is missing. Not only that, but Mikuru claims she has never known Kyon before, Koizumi is also missing, and Yuki has become the sole member of the literature club. The SOS Brigade seems to have never existed, nor has Suzumiya Haruhi. No one in the school has ever heard about her... except for Kyon.

Now it is up to him to travel back through time to find Haruhi and correct the temporal anomaly.

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Prequel: Suzumiya Haruhi no Yuuutsu (2009)
Alternative setting: Nagato Yuki-chan no Shoushitsu